The analysis of the causes of transformer oil leakage

 Seal:I plant oil leakage current transformer are mainly concentrated in four period of current transformer installed in the switching station,four period of current transformer is hunan liling cichang the mid - 90 - products,has been running more than eight years.Current transformer porcelain jacket with electrical motor expander and tank adopts hanging flange connection,this structure has to be eliminated,manufacturers are now used for pressure coil flange connection,compared generator generator set with the hanging type connection,pressure coil flange connection has the advantage that can make the flange surface stress more evenly.

Manufacturers of technical improvement,also can prove the existence of hanging join some shortcomings.Current transformer primary winding through the upper porcelain set of asynchronous motor four terminals,derivation from the scene of the collapse of the transformer terminals can be found at a time,a terminal nanjing cichang the production of transformer and porcelain set of seal,the internal and external two flat pad.And a terminal liling,cichang production of transformer seal only outside a plane pad.Sealing wholesalemotor.blogspot.com structure differences make liling,cichang transformer produced a joint terminal sealing surface oil leakage occurred frequently.But now the liling manufacturer has also made the improvement to this sealing structure,in a terminal seal face to add a seam allowance,o-rings seals,how to be in one step.

What maintenance electrician to specific professional skills

A door technology can foothold in society.Maintenance electrician belongs to technical professionals,our country is lack of senior technicians,if electric motor 12v 500w you learn good,also is very promising in the future.Main master electrician: maintenance electrician knowledge and basic skills,indoor wiring installation,grounding device installation and maintenance,repair and maintenance of common transformer,disassembling and maintenance of various commonly used motor,commonly used low voltage apparatus and distribution equipment installation and maintenance,motor control circuit basic installation and maintenance,commonly used machine tools installation and maintenance of electrical wiring,electronic circuit installation and debugging,acmotortrading.blogspot.com electrical control circuit design,programmable power electric motors controller and its application.As to hard to learn,the key see yourself don't work hard,go for it,have confidence in myself,should be able to learn well.

Submersible pump motor repair 10 points for attention

Mine submersible pump motor electromagnetic part and ordinary motor basic same,therefore,electromagnetic failure and repair,but due to the particularity of explosion-proof motor.In carries on the repair or reconstruction,it shall comply with the following provisions: The relevant personnel should understand,repair units and the relevant national laws and regulations,explosion-proof standards for repair work and the relevant provisions of the qualified products.Second,the unit should have for explosion-proof motor repair process equipment and the necessary inspection and test apparatus.Before three,maintenance,should prepare the necessary technical data.Four,commissioning before the motor repair,check the cable entry,relay protection and wiring system,to ensure that the company is still in good condition and conform to the requirement of explosion protection.Five,to engage in explosion-proof motor maintenance personnel should undertake the necessary training.After six,after inspection and acceptance of the inspection items,is made by authorization of the explosion-proof test unit or recognition,can be in repair units; 

Think it is necessary to project still explosion-proof test unit by explosion-proof inspection unit.After repair,explosion-proof motor should be to use the department to provide the following documents: 1) fault inspection;2) repair work instructions;3) Motor vehicle replacement and repair parts catalog;4) inspection and test results;5) repair certificate.Eight,are not allowed to repair the piano pieces 1) by the size of glass,plastic or other unstable parts made of materials;2) fasteners;3) the manufacturer or explosion-proof code that can't repair parts,such as encapsulation component.A sign of nine,after the repair will not affect the explosion-proof performance of repair,after repair without repair.Ten,the flame-proof certification after after repair motor repair the repair unit inspection department shall issue certificate of approval.Described above shall include at least by repairing the name,type,specification,water pump explosion-proof motor logo,the name of the class units and its approval certificate number,explosion-proof certificate number,date of repair,etc.The standard code for GB3836.13-1997 after the repair.Signs must be norm,durable,and resistant to chemical corrosion.Signs should be metal materials,commonly permanently fixed on the motor after the repair,repair again,after repair,the previous repair sign shall be removed.

The classification of ac contactor purposes

 Contactor is a kind of automation control of electrical appliances.Contactor is mainly used for frequent connected or diplomatic acmotortrading.blogspot.com relations,dc,has a large capacity of control,remote operation,relay can realize timing operation and interlock control,all kinds of quantitative control and the pressure loss and under-voltage protection,widely used in automatic control circuit,the main control object is motor,can also be used to control other electric power load,such as electric heaters,lighting,electric welder,capacitor Banks,etc.Contactor can be divided by accused of www.dongfeng- motor.com current type ac contactor and dc contactor.Here introduces the commonly used ac contactor.Communication can be divided into the electromagnetic contactor and vacuum type electric motors price two kinds.Model shows that:(1) the above model for the standard model,in recent years,the new developed B series ac contactor,its ac electric motor model for BXX.(2) electromagnetic ac contactor ware for CJ.Vacuum type ac contactor ware for CZ.

Permanent magnet synchronous motor

Permanent magnet synchronous motor in the 1950 s.Its operation principle is the same as the ordinary electric excitation synchronous motor,but it to replace the field winding,permanent magnet motor structure more simple,improve the www.dongfeng-motor.com reliability of the motor running. With the development of power electronic technology and microcomputer,in the 1970 s,began to permanent magnet synchronous motor is applied to ac variable frequency speed regulation system.In the 1980 s,the development of rare earth permanent magnet material breakthrough Progress,especially the residual magnetism,high coercive force large and low prices of the third generation of new type of NdFeB permanent magnet materials (NdFeB),greatly promote the development of permanent magnet synchronous motor speed regulating system.

In particular I Are a large country with a rare earth materials,rare earth reserves and extraction of rare earth metals are the highest in the world.With the continuous permanent magnet motors for sale development of rare earth materials and technology,permanent magnet magnetic energy product has been high,the price also should meet the industry early The need of use,combined with vector control level unceasing enhancement,the permanent magnet synchronous motor is more and more big show high efficiency and power density,wide speed range and small ripple torque,etc.The advantages of high performance.In the rare earth permanent magnet materials in China And the scientific research level of rare earth permanent magnet motor has reached the international advanced level.

The application of the new type of permanent magnetic material in motor not only promote the motor structure,the design method and manufacturing process of the reform,but also ac three phase motormakes the permanent magnet synchronous .The performance of the motor have a qualitative leap,rare earth permanent magnet synchronous motor is high-power (ultra high speed,high torque) the direction of miniaturization,intelligent,high-performance,become an important branch in the field of ac speed regulation [1] [2]. Due to the power switch components,permanent magnetic material and drive control technology development level,the permanent magnet synchronous motor with rectangular wave form at first,on the principle and control single phase capacitor start induction motormode basically similar to dc motor,but it Kind of motor torque is larger fluctuations.In order to overcome this shortcoming,people on the basis of and developed the sine wave with position sensor,inverter driven permanent magnet synchronous motor,this makes the permanent magnet synchronous motor The broader prospects.

The maintenance of construction machinery used in motor brush?

(1) brush label shall comply with the working characteristic of motor,shall not be used on 1 electric motor brush two different symbols.(2) there should be no shaking of the brush in the brush and stagnation phenomenon,brush and brush holder should 220v electric motor be 0.10 ~ 0.20 mm gap between brush edge to the slip ring or distance on the surface of the commutator with 2 ~ 4 mm advisable.(3) the brush and the connection of copper braid,the connection of copper braid and brush holder shall be ensure good contact perkins diesel generator and secure. Copper braid shall not and motor rotational part to touch or touch shell grounding.(4) the brush on the slip ring or commutator pressure numerical should comply with the regulations of brush label and manufacturing plants,or adjust to the lowest pressure,no sparks in general is 0.15 ~ 0.25 KGF/cm~2 (5) brush wear IE2/IE3 electric motor degree,shall not be more than two-thirds of the original standard height.(6) after brush wear,should be replaced by the original label,and will contact with glass sand,make www.dongfeng-motor.com the contact area of not less than 75%.

Motor common terms

The term Output: refers to the motor can be carried out within the time unit of work, and in accordance with the speed of the motor and the torque to decide. Rated output: motor in the rated voltage, rated frequency can exert its most excellent properties, and continuously produce all kinds of energy output at the same time, such as speed or torque values. Usually motor nameplate on values in the rated output. Asia usually in watts (W) as the unit, Europe and the United States use the horsepower (HP). Rated output (capacity) : rated output power (watts). HP: one of the motor output power unit for HP (Horse power, "HP"), 1 horsepower (HP) = 746 watt (Watts) Rated voltage: when used to allow the input voltage, use more than the rated voltage, the motor usually can still work, but can significantly shorten the service life of the capacitor, and even produce high fever and burned after running for a long time. Use the unit with V (V). torque Starting torque: refers to the motor torque generated at the moment of startup, if motor by a greater wholesalemotor.blogspot.com friction torque Motor vehicle than that suppress load, the motor will not be able to start. Also known as the starting torque. Stop torque: refers to the motor in a certain voltage, under a certain frequency can output the maximum torque, once carries the load beyond the range of torque, motor and then stop. Rated torque: refers to the motor under the rated voltage, rated frequency can produce continuously at rated output torque. Is generated by the torque when the rated speed. speed The rated rotor balancing machine speed: refers to the rated speed, the output of the motor do for motor under the trouble-free use the ideal of running speed. No load speed: refers to the speed of motor with no load condition. The CW or CCW: refers to the running direction of the motor. The CW to see from the output shaft end of the clockwise direction, while it is counterclockwise.